1. 24 Jul, 2014 3 commits
  2. 23 Jul, 2014 14 commits
  3. 21 Jul, 2014 12 commits
  4. 20 Jul, 2014 7 commits
  5. 19 Jul, 2014 4 commits
    • Eric Sandeen's avatar
      btrfs: test for valid bdev before kobj removal in btrfs_rm_device · 0bfaa9c5
      Eric Sandeen authored
      commit 99994cde btrfs: dev delete should remove sysfs entry
      added a btrfs_kobj_rm_device, which dereferences device->bdev...
      right after we check whether device->bdev might be NULL.
      
      I don't honestly know if it's possible to have a NULL device->bdev
      here, but assuming that it is (given the test), we need to move
      the kobject removal to be under that test.
      
      (Coverity spotted this)
      Signed-off-by: default avatarEric Sandeen <sandeen@redhat.com>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      0bfaa9c5
    • Liu Bo's avatar
      Btrfs: fix abnormal long waiting in fsync · 98ce2ded
      Liu Bo authored
      xfstests generic/127 detected this problem.
      
      With commit 7fc34a62, now fsync will only flush
      data within the passed range.  This is the cause of the above problem,
      -- btrfs's fsync has a stage called 'sync log' which will wait for all the
      ordered extents it've recorded to finish.
      
      In xfstests/generic/127, with mixed operations such as truncate, fallocate,
      punch hole, and mapwrite, we get some pre-allocated extents, and mapwrite will
      mmap, and then msync.  And I find that msync will wait for quite a long time
      (about 20s in my case), thanks to ftrace, it turns out that the previous
      fallocate calls 'btrfs_wait_ordered_range()' to flush dirty pages, but as the
      range of dirty pages may be larger than 'btrfs_wait_ordered_range()' wants,
      there can be some ordered extents created but not getting corresponding pages
      flushed, then they're left in memory until we fsync which runs into the
      stage 'sync log', and fsync will just wait for the system writeback thread
      to flush those pages and get ordered extents finished, so the latency is
      inevitable.
      
      This adds a flush similar to btrfs_start_ordered_extent() in
      btrfs_wait_logged_extents() to fix that.
      Reviewed-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
      Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
      Signed-off-by: default avatarChris Mason <clm@fb.com>
      98ce2ded
    • Linus Torvalds's avatar
      Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d0571909
      Linus Torvalds authored
      Pull locking fixes from Thomas Gleixner:
       "The locking department delivers:
      
         - A rather large and intrusive bundle of fixes to address serious
           performance regressions introduced by the new rwsem / mcs
           technology.  Simpler solutions have been discussed, but they would
           have been ugly bandaids with more risk than doing the right thing.
      
         - Make the rwsem spin on owner technology opt-in for architectures
           and enable it only on the known to work ones.
      
         - A few fixes to the lockdep userspace library"
      
      * 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER
        locking/mutex: Disable optimistic spinning on some architectures
        locking/rwsem: Reduce the size of struct rw_semaphore
        locking/rwsem: Rename 'activity' to 'count'
        locking/spinlocks/mcs: Micro-optimize osq_unlock()
        locking/spinlocks/mcs: Introduce and use init macro and function for osq locks
        locking/spinlocks/mcs: Convert osq lock to atomic_t to reduce overhead
        locking/spinlocks/mcs: Rename optimistic_spin_queue() to optimistic_spin_node()
        locking/rwsem: Allow conservative optimistic spinning when readers have lock
        tools/liblockdep: Account for bitfield changes in lockdeps lock_acquire
        tools/liblockdep: Remove debug print left over from development
        tools/liblockdep: Fix comparison of a boolean value with a value of 2
      d0571909
    • Linus Torvalds's avatar
      Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d1743b81
      Linus Torvalds authored
      Pull scheduler fix from Thomas Gleixner:
       "Prevent a possible divide by zero in the debugging code"
      
      * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        sched: Fix possible divide by zero in avg_atom() calculation
      d1743b81